docs: def create_percolator(self, index, name, query, **kwargs):
          """
          Create a percolator document
  
          Any kwargs will be added to the document as extra properties.
          """
          if isinstance(query, Query):
              query = {"query": query.serialize()}
          if not isinstance(query, dict):
              raise InvalidQuery("create_percolator() must be supplied with a Query object or dict")
          if kwargs:
              query.update(kwargs)
  
          path = make_path(index, '.percolator', name)
          body = json.dumps(query, cls=self.encoder)
          return self._send_request('PUT', path, body)